class Person():
    def eat(self):
        print('人吃.....')

        caichang=Person
        caichang.eat()

class Person():
    def eat(self):
        caichang=Person
        caichang.eat()

class Person():
    def eat(self):
        caichang=Person  # caichang实例化了Person,Person有一个对象叫caichang

        caichang.eat()
